Valve



FIG. 1 is a top, front side, right end perspective view of a valve embodying the design;

FIG. 2 is a right end view thereof, the left end view being a mirror image thereof;

FIG. 3 is a front side view thereof, the rear side view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a valve, as shown and described. 